Bed-and-cylinder printing-press.



A. 1H. BROWBR. BBD AND `GYLIINTDR PRINTING PRESS.

APPLICATION FILED JULY 20, 1906.

Patented June 14,1910.

5 SHEETS-SHEET 1.

ANDREW Ev GRAHAM ce. wnomumouawnzaswAsmNGTDN. no.

A'. T. H.. BROWER. BBD AND CYLINDER PRINTING PRESS.

APPLICATION FILED JULMU, 190s.

961,206. 'PatenteaJune14,191o.

5 SHEETS*SHEET 2.

Mmm xsA mun/m :cA wumumacmmma wAsumuTuN, s a

A. T. H. BROWER.

BED AND CYLINDER PRINTING PRESS.

l APPLICATION FILED JULY 20, 1906.

961,206. Patented June 14,1910.

5 SHEETS-SHEET 3.

A. 'I'. H. BROWER.

BED AND CYLINDER PRINTING PRESS.

APPLICATION FILED JULY zo, 1906.

Patented June 14, 1910.

5 SHEETS-SHEET 4.

ANDREW B sp1/mm Cn., PwomunnanAPHERs, WASHINGTON. n.1:

A. T. H. BROWBR.

BED AND CYLINDER PRINTING PRESS.

APPLICATION FILED .IULY 20, 1906.

Patented June 14, 1910.

5 SHEETS-SHEET 5.

lthe construction shown in Fig. 7.

ABRAHAM T. I-I. BROWER, OF CHICAGO, ILLINOIS.

BED-AND-CYLINDER PRINTING-PRESS.

Specification of Letters Patent.

Application filed .Tuly 20, 1906.

Patented June 14:, 1910. serial No. 326,964.

T all whom t may concern:

Be it known that I, ABRAHAM T. H. BRowER, a citizen of the UnitedStates, residing at Chica o, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements in Bed-and-Cylinder Printing-Presses, of which I do declare the following to be afull, clear, and exact description, reference being had to theaccompanying drawings, forming part of this specification.

One main object of my present invention is to provide an improved meansfor increasing the speed of bed-and-cylinder presses and this object Iaccomplish by giving to the bed a return impetus immediately after itstrunnions have passed the center of the cam shoes whereby the reversalof the bed is effected.

The invent-ion has for its further object to provide features ofimprovement that shall materially contribute to the speed and accuracyof the press.

lit-h these several objects in view the invention consists in thefeatures of novelty hereinafter described and illustrated in theaccompanying drawings and particularly pointed out in the appendedclaims.

Figure 1 is a view in side elevation of a bed-and-cylinder pressembodying my invention. Fig. 2 is a plan view (parts being shown insection) illust-rating the mechanism beneath the bed of the press. Fig.3 is a view in vertical cross section on line 3 3 of Fig. 1. Fig. l is adetail view in vertical sec-tion on line fle-4l of F ig'. 3,illustrating more particularly one of the cam shoes, or reversing shoesof the press. Fig. 5 is a view in vertical longitudinal section on line5 5 of Fig. 3. Fig. 6 is a view in vertical longitudinal section on line6-6 of Fig. 3. Fig. 7 is a view similar to Fig. 6 but illustrating amodification of the invention. Fig. 8 is an enlarged detail view showingone of the cam-wheels illustrated in Fig. 7. Fig. 9 is an enlargeddetail view of section through the three-way valve employed in Fig. 10is a view similar to Fig. 7 but illustrating a further modication of theinvention.

A designates the main frame of the machine whereby the bed B and thecylinder C are sustained. The bed B is mounted to reciprocate over theways a of the main frame A and the cylinder C is carried by shaft c thatis journaled inuprights at the sides of the main frame and is providedat one end with a gear wheel that meshes with the gear wheel 16 keyed toone of the sections 17 of the bed rack pinion shaft. The other section18 of the bed rack pinion shaft extends from the opposite side of themachine to a point adjacent its center and the sections 17 and 18 aresuitably journaled in bearings on the main frame. The section 17 of thebed rack pinion shaft has Xed to it adjacent its inner end a beveledgear wheel 19 and similarly a beveled gear wheel 20 is fixed adjacentthe inner end of the bed rack pinion shaft section 18, and these beveledgear wheels 19 and 20 are connected together by a beveled gear wheel 21that is journaled in a suitable bearing 22 of the main frame. To theeXtreme inner ends of the sections 17 and 18 of the bed rack pinionshaft are keyed respectively the bed rack pinions 23 and 24 that arearranged in close proximity and will travel in opposite directions.

Upon the under side of the bed B the bed rack 25 is mounted in a mannerpermitting it to be shifted at right angles to the path of movement ofthe bed, in order thatthe bed rack 25 may be brought into position toengage either of the bed rack pinions 23 or 24. As shown the bed rack 25is formed with dovetailed channels 2o adjacent its ends (see Fig. 5)that engage corresponding I dovetailed ribs 27 upon the under side ofthe bed B, and the ribs 27 thus support the rack 25 while allowing it tobe shifted transversely of the bed.

By reference more particularly to Figs. 1, 2 and 3 of the drawings itwill be seen that when revolution is imparted to one of the sections ofthe bed rack pinion shaft the bed rack pinions 23 and 24 will revolve inopposite directions and the bed B will be driven either forward orbackward accordingly as it is in engagement with one or the other ofthese pinions. The pinion 23 serves to impart the forward or printingmovement,

to the bed B while the pinion 24 imparts to the bed B the backward oridle movement.

Inasmuch as the cylinder shaft o is directly geared to the gear wheel 16of the bed rack pinion shaft section 17, the danger of lost motion or ofinaccuracy of movement between the bed and cylinder is materially lessthan in the constructions in which the bed rack pinion shaft is not thusdirectly geared to the shaft of the cylinder. Moreover, inasmuch as thebed rack 25 is located above the pinions 23 and 24 and as close aspossible to the bed B a more direct and positive application of power istransmitted from the bed rack pinion shaft to the bed than is possiblewith constructions in which the bed rack is suspended at a distancebeneath the bed. The bed rack pinion 24 which imparts the return or idlemovement to the bed is driven from the section 17 of the bed rack pinionshaft through the intermediate beveled gearing shown but the presence ofsuch intermediate gearing is not believed to be detrimental foreffecting the return movement of the bed since during such movement thesame accurate coincidence between the bed and cylinder is not requiredas upon the forward or printing movement of the bed.

In order to effect a transverse shift of the bed rack 25 to cause it toengage with one or the other of the bed rack pinions 23 and 24, themechanism next to be described is preferably employed. By reference moreparticularly to Figs. 3 and 5 of the drawings, it will be seen thatthrough the lower portions of the bars 28 that extend from the bed rack25 are formed slots through which passes a shifter bar 30 (see Figs. 2,3 and 5) the slotted ends of which bar are pivotally connected as at 31to crank arms 32; each of these crank arms being carried by itscorresponding shaft 33 that is journaled in a bracket 34 at thecorresponding end of the main frame. The lower end of each of the shortvertical shafts 33 has keyed thereto a beveled pinion 35 that mesheswith the beveled gear 36 mounted upon the shaft 37 that is journaled insuitable bars 38 at the end of the main frame. Each of the shafts 37 haskeyed thereto at one end a crank arm 40 and the slotted lower ends ofthe crank arms 40 are united by a connecting bar 41 (see Fig. 5) thatextends from end to end of the machine. The bar 41 is slotted adjacentits center and through this portion of the bar 41 pass several shafts tobe presently described. From the side of the bar 41 projects astud 42that enters a cam shaped groove 50 that is formed in the side of thegear wheel 51, this gear wheel being mounted upon the shaft 52 (seeFigs. 3 and 5) journaled in bearings of the main frame. Revolution isimparted to the gear wheel 51 by pinion 54 that is mounted upon theshaft 55. The shaft 55 has keyed thereto a gear wheel 56 that mesheswith a pinion 57 upon the section 18 of the bed rack pinion shaft.Hence, it will be seen that as the bed rack pinion shaft sections haverevolution im parted thereto, revolution will be transmitted from theshaft section 18 and its pinion 57 to the gear wheel 56, the shaft 55and the gear wheel 51, and as the gear wheel 51 is thus revolved, thecam groove 50 in the side of this gear wheel will cause the shifter rod41 to travel back and forth as will be clearly seen by reference to Fig.5 of the drawings. As the rod 41 is thus shifted, it will in turn rockthe crank arms 40 and the shaft 37 thereby causing the beveled gearwheels 35 and 36 to rock the short vertical shafts 33 and cause thecranks 32 at the upper ends of said shafts to move transversely theshifter bar 30. As the shifter bar 30 is thus moved (see Fig. 3) it willproduce a corresponding transverse movement of the bed rack 25 therebycausing this rack to leave the path of one of the bed rack pinions 24,for example, and pass into position to engage the other bed rack pinion23 or vice versa. It will be understood, of course, that this shiftingof the bed rack 25 will be effected when the bed completes its movementsand after the rack 25 is free from engagement with the pinions.

As shown, there are four gear wheels corresponding to the gear wheel 56above described, two of these gear wheels receiving revolution from thesection 18 of the bed rack pinion shaft and the other two of such gearwheels receiving revolution from the section 17 of the bed rack pinionshaft. The construction and arrangement of these gear wheels will beunderstood by reference more particularly to Figs. 2, 3, 5 and 6 of thedrawings. Thus, by reference to Fig. 6, it will be seen that with thepinion 57 on the section 18 of the bed rack pinion shaft meshes the gearwheel 56 and the corresponding gear wheel 60 and by reference to Figs. 2and 3 it will be seen that gear wheels 61 and 62 mesh with the pinion 63that is mounted upon the section 17 of the bed rack pinion shaft. Thegear wheels 61 and 62 are the same in construction as the gear wheels 56and 60 shown in Fig. 6 of the drawings, and like these gear wheels areprovided each with a cam groove 64 upon its inner face. The gear wheel60 is mounted upon a shaft 66, and the gear wheels 61 and 62 are mountedrespectively upon the shafts 67 and 68, these several shafts beingjournaled in ,bearings of the main frame. Beneath the gear wheels 56 and60 extend the shafts 70 and 71 that carry respectively the rock arms 72and 73, and similarly beneath the gear wheels 61 and 62 extend theshafts 74 and 75 that carry respectively the rock arms 76 and 77. Eachof the rock arms 72, 73, 76 and 77 has a stud 78 projecting from itsside and entering the cam shapedgroove 64 of the adjacent gear wheel 56,60, 61 or 62. The upper end of each of the rock arms 72, 7 3, 76 and 77is pivotally connected the inner end of a rod 8O and the outer end ofthis rod is pivoted as at 81 to a lever 82 that is mounted upon a shaft83 at the end of the main frame. To the upper end of each of the levers82 is pivoted as at 84 the outer end of the stem 85 of a piston 86 thatcloses the end of a dash-pot 87 located at the top of the main frame ofthe machine.Y As shown, there are four of these dash-pots 87 and each isequipped with a piston 86 and parts connected thereto as shown moreparticularly' in Figs. 2 and 6 of the drawings. The open inner end ofeach of the dash-pots 87 is adapted to receive a plunger 90, the stem 91of which is fixed to a block or bar 92 depending from the under side ofthe bed B. In order to equalize the compression within the dash-pots 87at each end of the main frame, when plural dash-pots are used, they maybe connected together as by a pipe 94v or hollow rods may be employedfor the plungers 90, t-hese hollow rods being connected together by asuitable pipe or channel so that when the plungers enter the dashpotsthere will be a. free passage of air from one dash-pot to the other thusequalizing the resistance in the dash-pots. Vhen the dashpots areconnected by pipe 94 such pipe will enter them at a point slightly inadvance of the pistons 86.

My purpose in providing the dash-pots 87 with movable pistons S6 and inproviding suitable means such, for example, as the cam-wheels 56, 60,&c. for imparting movement to the pistons S6 is togive to the bed of thepress a return impetus immediately after the bed reversing mechanism (tobe presently described) has checked the momentum of the bed and theparts are in such position that the reverse movement of the bed may beeffected. The gear wheels 56, 60, 61 and 62 have their movement so timedwith respect to the travel of the bed and the cam groove 6l of each ofthese gear wheels is so shaped that when the bed B reaches the end ofits travel in either direction and its momentum has been checked by thereversing mechanism (to be presently described) and by the dash-potsalready described, the cams 64 of the gear wheels 56, 60, 61 and 62 willimpart an inward movement to thel pistons S6 and will cause thesepistons to exert a corresponding thrust upon the plungers 90 that areattached to the underside of the bed B, thereby giving a quick initialmovement to the bed which will not only materially increase its speedbut will also save the teeth of the bed rack and the bed rack pinionsfrom the excessive strain incident to an engagement of the bed rack andits pinions when the latter are driven at a very high speed. The volumeof air compressed within the dash-pots between the plungers 90 and thepistons 86 will be found a most effective medium through which totransmit the inward thrust of the pistons 86 to the bed.

While any of the usual means may be employed for checking and reversingthe bed B at the ends of its movement, I prefer to employ the novelconstruction of reversing mechanism next described. My improvedreversing shoe is shown as comprising` wheels 100 and 101 that aremounted upon the sections 17 and 18 of the bed rack pinion shaft. Eachof these wheels 100 and 101 is formed with a cam groove 102 extendingacross its face and into each of these cam grooves 102 projects a studor trunnion 103 that is carried by an arm 104- depending from theunderside of the bed B. The ends of the cam grooves 102 are formedHaring so as to facilitate the entrance of the studs 103 into thesegrooves. The first half of the grooves or cam ways are so shaped thatthey serve to slow down the bed while carrying it on so that the rackshall leave the rack pinion, after which the rack will be laterallyshifted. The second half of the cam grooves or ways is a reverse of thefirst half so that when the bed movement has been checked it will bereversed with 'a movement that gradually increases until itapproximately equals the maximum speed atvwhich it is intended to traveland at which time it will be delivered to the bed rack pinion.

As shown motion is imparted to the gear wheel 16 on the outer end of thebed rack pinion shaft, from a pinion 110 that is fixed to a short driveshaft 111 that has its inner end journaled in the side of the main frameA and in a standard 112 that rises at one side of the main frame; andupon the drive shaft 111 are mounted the fast and loose pulleys 113 and1111 adapted to receive a driving belt (not shown).

From the construction of parts as thus far described, it will be seenthat when revolution is imparted to the drive shaft 111, motion will betransmitted therefrom by the pinion 110 and gear wheel 16 to the bedrack pinion shaft section 17 and from the gear wheel 16 to the gear 15and cylinder C. During the forward or printing movement of the bed B itsrack 25 will be in engagement with the gear 23 at the inner end of thesection 17 of the bed rack pinion shaft and hence it will be seen thatthe bed rack pinion shaft and the cylinder' shaft c will be united `byone pair of gear wheels so that during the forward or printing movementof the bed the gearing between the cylinder and bed is reduced to aminimum and the danger of lost motion between these parts is renderedmuch less than would be the case if intermediate gearing were employedbetween the gear wheels upon the cylinder shaft and the bed rack pinionshaft. So also it will be seen that inasmuch as the bed rack 25 ismounted beneath the bed B the power would be most eectively and directlyapplied to the bed from the bed rack pinion shaft.

1t will be understood, of course, that during the forward or printingmovement of the bed its rack 25 will be in engagement with the gearwheel 23.011 the inner end of the bed rack pinion shaft section 17 butas the bed B approaches the end of its t-ravel in a forward directionits studs or trunnions 103 (see Fig. 4) will pass into the cam grooves102 of the reversing shoes or wheels 100 101 and the movement of the bedin forward direction will thus be arrested and immediately thereafterthe reversing shoes or wheels 100 101 will occupy such position as toaid in starting the bed B upon its return or idle movement.

rIhe cam-wheels 56, 60, 61 and 62 will occupy such positions withrespect to the sections 17 and 1S of the bed rack pinion shaft andconsequently with respect to the reversing shoes or wheels 100 101 thatas soon as the studs or trunnions 103 have crossed the centers of thereversing shoes or wheels 100 101 the cam ways or grooves 64 in thewheels 56, 60, 61 and 62 will cause the studs 7S to rock the arms 72 andthrough the medium of the rods SO to rock the arms 82 thereby causingthe pistons 86 to move inward and further compress the air in thedash-pots 87 so as to exert a quick initial pressure upon the plungers90 and give a reversing impetus or initial movement to the bed B.

It will be understood, of course, that the cam grooves 64 of the wheels56 and 61 at one side of the center of the press (see Fig. 6) arearranged in a position reverse to that of the cam grooves 64 in thewheels 60 and 62, as the wheels 56 and 61 perform their function ofimparting an initial impetus to the bed when the bed is in the positionshown in Fig. 6, while the wheels 60 and 62 perform a similar functionwhen the bed is at the opposite end of its travel. By thus giving to thebed immediately after it has been arrested by the reversing` shoes aquick initial movement, the bed rack 25 as it engages the pinions 23 or24 will have such momentum that the strain upon the teeth of the bedrack 25 and the pinions will be very greatly reduced and, consequently,the pinions 23 and 24 may be run at a correspondingly higher speed.Hence, without danger of severe strain or breakage of parts, the speedof the press may be materially increased.

By reference to Fig. 5 of the drawings it will be seen that as the bed Breaches the end of its travel in either direction, the bed rack 25 willpass from engagement with the pinions 23 and 24 and at such time the bedrack 25 will be shifted transversely of the bed through the medium ofthe rock arms 32. the shifter bar 30, the gear wheels and 36, the rockarms 40 and the rod 41, the stud 42 of the rod 41 serving to impart tothe rod 41 the movement which this stud receives from the cam groove 50of the wheel 51. The wheel 51 will be so positioned with respect to thebed rack pinion shaft that the cam groove 50 of this wheel 51 will shiftthe rod 41 at the time that the bed B reaches approximately the end ofits travel in either direction and after the bed rack 25 has passed fromengagement with the teeth of the driving pinions 23 and 24.

So far as I am aware my present invention presents the first instance ofa bed-andcylinder press in which provision has been made for imparting aquick initial return impetus to the bed otherwise than by the usualreversing shoes. In carrying out this broad feature of my invention,mechanism of Various kinds may be employed. Thus, for example, in Figs.7 9 of the drawings I have shown means whereby the initial returnimpetus given to the bed may be effected by compressed air. In theseviews of the drawings there are shown two compressed air tanks 115, onelocated at each end of the machine, although obviously a single storagetank may be used. The tanks 115 are connected by suitable pipes 116 withthe outer ends of the dash-pots 87 and in each of the pipes 116 there isarranged suitable valve mechanism for controlling the admission ofcompressed air to the dash-pots. As shown each pipe 116 has interposedtherein a threeway valve casing 120 having an escape port 121 and havinga compressed air delivery port 122 and a port 123 whereby the valvecasing is connected to the dash-pot. The three-way valve 124 within thecasing 120 has its ports arranged as shown in Fig. 9 of the drawings andto this valve 124 is connected a rock arm 125 to which is attached a rod126 that is pivoted to the end of a rock arm 127 mounted upon a shaft128 suitably supported in the main frame. From each of the rock arms 127projects a stud 129 that enters a cam groove 130 in a wheel that isgeared to the bed rack pinion shaft. In Fig. 7 of the drawings I haveshown two Cain-wheels 131 and 132 the peripheral teeth of which engagewith a pinion on the bed rack pinion shaft and the wheel 132 is formedwith a cam groove 130 like that of the wheel 131 and performing a likefunction. The cam groove 130 is of such shape that while the bed B istraveling in the direction of the arrow (Fig. 7), the stud 129 will bewithin the circular portion of the cam groove 130; and at such time thethreeway valve 124 will occupy the position shown in Fig. 9 so as toallow a restricted escape of air from the dash-pot 87 as the plunger 90passes into the dash-pot. As the bed B reaches the limit of itsmovement, the irregular portion of the cam groove 130 acts upon the stud129 thereby causing the threeway valve 124 to be shifted in such mannerthat the escape of air from the dash-pot through the port 121 is cut offand communication is established through the valve between the ports 122and 123 thus admit ting compressed air from the tank or reservoir 115 tothe outer end of dash-pot 87. When compressed air is thus admitted tothe outer end of the dash-pot, it will exert its pressure upon theplunger 90 at such time within the dash-pot and will serve to impart aquick initial impetus to the bed. The shape of the cam grooves 130 willbe such, as indicated in Figs. 7 and 8 of the drawing, that thethree-way valve 124 will be shifted so as to admit compressed air to thedash-pot S7 in propel` amount and so as to restore the three-way valveto the position shown in Fig. 9 of the drawings before the plunger 90leaves the dash-pot and while the stud 129 is moving in the circularportion of the cam grooves 130 the three-way valve will be maintained inthe position shown in Fig. 9 of the drawing.

In Fig. 10 oi' the drawing, I have illustrated another modified form ofmechanism for imparting an initial thrust or impetus to the bed Bimmediately after the reversing shoes have arrested the motion of thebed and have moved to such extent as to enable the bed to be startedupon its reverse travel. In this form of the invention there dependsfrom each end of the bed B one or more brackets 140 that carry at theirfree ends studs 141, each of these studs being arranged in position toengage a vertical rock arin 142 that is pivotally mounted as at 143 upona bracket 144 extending from the end of the main frame A. To each of therock arms 142 is connected a rod 145 that passes through an opening inthe end of the main frame and carries a coil spring 146 that is heldupon the rod 145 by means of suitable nuts 147, the spring 146 tendingto draw the rock arm 142 inward toward the main frame as shown at theleft-hand side of Fig. 10 of the drawing. To each of the rock arms 142is connected a slotted outer end of a rod 148, the slot at the outer endof this rod sitting over a stud 149 of the rock arm and the inner end ofthe rod 14S is pivotally connected to the upper end of the rock arm 150that is mounted upon a shaft 151 suitably sustained by the main frame.From the side of each of the rock arms 150 projects a stud 152 thatenters a cam groove 153 formed in a gear wheel adjacent thereto. Byreference to Fig. 10, it will be seen that there are two gear wheels 154and 155 each provided with cam grooves 153. Each of these gear wheelsmeshes with a pinion mounted upon the bed rack pinion shaft.

From the foregoing description, it will be seen that when bed B reachesthe end of its travel as indicated in Fig. 10 of the drawing, the stud141 beneath the outer end of the bed will engage the cam-shaped upperend of the rock arm 142 thereby moving this rock arm outward andcompressing the coil spring 146. As the rock arm 142 is thus movedoutward its stud 149 will approach the end of the slot of the rod 148and at such time the stud 152 of the rock arm 150. will enter theirregular or noncircular portion of the cam groove 153 of the wheel 154.As the wheel 154 is revolved in the direction of the arrow (F ig. 10) itwill cause the rock arm 150 to move inward thereby causing the rod 148to draw inward the rock arm 142, and this inward movement of the rockarm 142 will force its upper end to exert an initial thrust upon thestud 141 depending beneath the end of the bed B and thus give the bed aquick impetus which will cause the bed rack to initially engage the bedrack pinion at a much higher speed than would be possible if the actionof the ordinary reversing shoes were relied upon to effect the initialreverse movement of the bed.

So far as I am aware, the present invention presents the irst instanceof a bed movement in which the ordinary checking and reversing shoes aresupplemented by mechanism comprising a member carried by the bed, amember supported by the main frame and means for imparting a thrust tothe member' carried by the bed immediately after the reversing shoeshave arrested the movement of the bed and left the members in positionfor the reverse travel. The modied form of the invention illustrated inFigs. 7 and 10 of the drawings show how, without departing from thespirit of the invention, it may be embodied in various forms.

I do not wish to be understood as claiming in this application featuresshown herein but claimed in my application, Serial No. 437,674.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. The combination with a reciprocating bed and with devices forchecking and reversing the movement of said bed, of mechanism for givingto the bed an initial return impetus, comprising a member carried by thebed, a member carried upon the main frame and means for impart-ing tothe member carried by the main frame a positive thrust in excess of therecoil of the checking mechanism immediately after the movement of thebed has been arrested.

2. The combination with the reciprocating bed and mechanism foroperating and reversing said bed, of a dash-pot mechanism for checkingthe movement of said bed comprising cooperating members mounted on thebed and on the machine frame, and means'for operating said frame memberto maintain the maximum pressure attained in said dash-pot mechanism andfor thrusting said frame member inwardly at the end of the movement vofthe bed, whereby a positive impetus in excess of the recoil of saiddash-pot mechanism is imparted to the bed to start the saine on itsreturn movement, substantially as described.

3. The combination with a reciprocating bed and with reversing shoes andstuds, of mechanism for checking the movement of the bed and means forgiving to said checking mechanism immediately after the movement of thebed has been arrested, an inward thrust in excess of the recoil of thechecking mechanism, in order to impart an initial return impetus to thebed.

4. The combination with the reciprocating bed and mechanism foroperating the same and reversing the movement thereof, of a dash-potmechanism for checking the movement of said bed comprising coperatingmembers mounted on the bed and on the machine frame, and means forholding said frame member stationary during the checking operation ofsaid dash-pot mechanism and for thrusting said frame member inwardlyimmediately after the movement of the bed has been arrested to impart apositive impetus in excess of the recoil of the dash-pot mechanism tothe bed to start the same upon its return movement, substantially asdescribed.

5. The combination with the reciprocating bed and mechanism foroperating the same and for reversing the movement thereof, of dash-potmechanism for checking the movement of the bed comprising` a memberfixed to said bed and a coperating member movably mounted on the machineframe, and mechanism for positively reciprocating said frame member inopposite directions arranged to hold the same stationary during thechecking operation of said dash-pot mechanism and to thrust the sameinwardly immediately after the movement of the bed has been arrested,whereby a positive impetus in excess of the recoil of the dash-potmechanism is imparted to the bed to start the same upon its returnmovement, substantially as described.

6. The combination with a reciprocating bed and with a main frame, ofdash-pot mechanism for checking the movement of said bed comprisingcylinders mounted at opposite ends of said main frame, plungers carriedby the bed and adapted to enter said cylinders, pistons mounted withinthe outer ends of said cylinders and means for imparting a positivethrust to each of said pistons immediately after the movement of the bedhas been arrested, in order to give an initial return impetus to thebed.

7. In a bed-and-cylinder printing press the combination with areciprocating bed, of mechanism for imparting a quick initial returnmovement to the bed at the ends of its travel in each direction, saidmechanism comprising parts projecting beneath the opposite ends of thebed, members arranged at the opposite ends of the main frame to engagesaid projecting parts and means for imparting to each of said members apositive thrust in excess of the recoil of the checking mechanismimmediately after the movement of the bed has been arrested.

8. In a bed-and-cylinder printing press the combination with the bed andwith the main frame, of dash-pot mechanism comprising cylinders mountedat the opposite ends of the main frame, plungers connected to theopposite end portions of the bed and adapted to enter the inner ends ofsaid cylinders, pistons movably mounted within the outer ends of saidcylinders and cam-wheels and connections therefrom to the pistons forimparting to said pistons, inward movement immediately after the bed hasreached the end of its travel.

ABRAHAM T. H. BRGVER.

Vitnesses:

Gmo. P. FISHER, Jr., LILLIAN PRENTIGE.

